Add Loggly handler.
LogglyHandler: remove reundant tag assignment and PHP 5.4 specific syntax.
Prevent throwing an exception in the case that the fatal error level is not set.
Also prevent throwing another exception in the case that the exception logger level is not set.

Also prevent throwing another exception in the case that the exception logger level is not set.
Merge pull request #271 from Petah/patch-1

Prevent throwing an exception in the case that the fatal error level is not set.
Merge remote-tracking branch 'sobstel/master'
Add check for curl ext
Update license headers
Update changelog/readme
Merge remote-tracking branch 'origin/master'